I haven't read all 169 posts on 100% CPU, so this my have been mentioned. I did search "Scheduled Tasks" but just a lot of threads about scheduling backups. I'm running XP Home SP3 (although the problem existed with SP2 also, however, I didn't realize it was NOD). Whenever the wizard starts my pc just locks up, even unable to open Task Manager, so I was never able to figure out what was causing it. So the same thing happened again today. After a reboot, I opened TM first then started the wizard and observed NOD32 spiking at 100%. I disabled NOD and the wizard worked quite normally. The wizard continues to run normally if NOD32 is disabled.